refactor(forms): wrapped all validators into the Validator class

modules/angular2/src/forms/validators.js

@@ -3,35 +3,37 @@ import {List, ListWrapper, StringMapWrapper} from 'angular2/src/facade/collectio
 
 import * as modelModule from './model';
 
-export function required(c:modelModule.Control) {
-  return isBlank(c.value) || c.value == "" ? {"required" : true} : null;
-}
+export class Validators {
+  static required(c:modelModule.Control) {
+    return isBlank(c.value) || c.value == "" ? {"required": true} : null;
+  }
 
-export function nullValidator(c:modelModule.Control) {
-  return null;
-}
+  static nullValidator(c:modelModule.Control) {
+    return null;
+  }
 
-export function compose(validators:List<Function>):Function {
-  return function(c:modelModule.Control) {
-    var res = ListWrapper.reduce(validators, (res, validator) => {
-      var errors = validator(c);
-      return isPresent(errors) ? StringMapWrapper.merge(res, errors) : res;
-    }, {});
+  static compose(validators:List<Function>):Function {
+    return function (c:modelModule.Control) {
+      var res = ListWrapper.reduce(validators, (res, validator) => {
+        var errors = validator(c);
+        return isPresent(errors) ? StringMapWrapper.merge(res, errors) : res;
+      }, {});
+      return StringMapWrapper.isEmpty(res) ? null : res;
+    }
+  }
+
+  static group(c:modelModule.ControlGroup) {
+    var res = {};
+    StringMapWrapper.forEach(c.controls, (control, name) => {
+      if (c.contains(name) && isPresent(control.errors)) {
+        StringMapWrapper.forEach(control.errors, (value, error) => {
+          if (!StringMapWrapper.contains(res, error)) {
+            res[error] = [];
+          }
+          ListWrapper.push(res[error], control);
+        });
+      }
+    });
     return StringMapWrapper.isEmpty(res) ? null : res;
   }
 }
-
-export function controlGroupValidator(c:modelModule.ControlGroup) {
-  var res = {};
-  StringMapWrapper.forEach(c.controls, (control, name) => {
-    if (c.contains(name) && isPresent(control.errors)) {
-      StringMapWrapper.forEach(control.errors, (value, error) => {
-        if (! StringMapWrapper.contains(res, error)) {
-          res[error] = [];
-        }
-        ListWrapper.push(res[error], control);
-      });
-    }
-  });
-  return StringMapWrapper.isEmpty(res) ? null : res;
-}